问题
选择题
For many years, people __ electric ears. However, making them has been more difficult than predicted.
A．had dreamed of
B．have dreamed of
C．dreamed of
D．dream of
答案
答案：B
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For many years, people __ electric ears. However, making them has been more difficult than predicted.
A．had dreamed of
B．have dreamed of
C．dreamed of
D．dream of
答案：B